Copper C101 (OFE) vs C110 (ETP): Which Grade to Choose?
C110 (ETP) is the cost-effective standard for most electrical and thermal applications. C101 (OFE) is reserved for ultra-pure requirements in vacuum, superconductor, and high-frequency applications where 99.99% purity matters.
Side-by-Side Property Comparison
| Property | Copper C101 (OFE Copper) | Copper C110 (ETP Copper) |
|---|---|---|
| Tensile Strength | 220 MPa (32 ksi) | 220 MPa (32 ksi) |
| Yield Strength | 69 MPa (10 ksi) | 69 MPa (10 ksi) |
| Hardness | 42 HRF | 45 HRF |
| Density | 8.94 g/cm³ | 8.94 g/cm³ |
| Machinability Rating | 20/100 | 20/100 |
| Thermal Conductivity | 391 W/m·K | 388 W/m·K |
| Melting Point | 1,083 °C | 1,083 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Copper C101 (OFE Copper) | Copper C110 (ETP Copper) | Winner |
|---|---|---|---|
| Purity | 99.99% | 99.9% | Copper |
| Conductivity | 101% IACS | 101% IACS | Tie |
| Oxygen Content | <0.0005% | 0.04% | Copper |
| Cost | 3-5x higher | Baseline | Copper |
| Availability | Limited | Widely available | Copper |
| Hydrogen Embrittlement | Immune | Susceptible | Copper |
Which Material Should You Choose?
Choose Copper C101 (OFE Copper) when:
- Vacuum and high-vacuum systems
- Superconductor components
- High-frequency waveguides
- Electron beam equipment
- Hydrogen brazing applications
Choose Copper C110 (ETP Copper) when:
- Bus bars and power distribution
- General electrical connectors
- Heat exchangers and heat sinks
- Grounding straps
- Cost-sensitive conductivity applications
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